That's some BS. They are practically the same vehicle. they are both built on the D7u chassis as far as I know and share many of the same components. They are as similar as an older RRS is to an LR3.
I have had quite a few customers tell me that their L322 Range Rovers had a much better ride than their current L405s. This is likely due to the aluminum architecture and suspension components. They don't ride as well, but they drive much better.
I dunno. The 2016 RRS my daughters mom has rides pretty choppy and bad - I've driven it quite a bit and wasn't impressed at all. Maybe it's those big dumb wheels/tires. I don't know, but the ride isn't good. Not even on par with my 2008 Tahoe. It's certainly more refined on shitty roads to some degree, but the overall ride isn't as good. I mean it's a quick SUV and pretty nice I guess, but I'd never buy one regardless of price.